Patches for DOSBox to add mt32emu MIDI device

dosbox-0.74-mt32-patch.diff - diff file to be applied to official DOSBox release v.0.74 source distribution.

dosbox-SVN-r4025-mt32-patch.diff - diff file to be applied to official DOSBox sources SVN r4025 (and up, hopefully).
                                   It uses a bit different and clear approach introduced since SVN r3836.
